Vec4d Raytracer::shade(const RayIntersection& intersection,
size_t depth) const
{
// This offset must be added to intersection points for further
// traced rays to avoid noise in the image
const Vec3d offset(intersection.normal() * Math::safetyEps());
Vec4d color(0,0,0,1);
std::shared_ptr<const Renderable> renderable = intersection.renderable();
std::shared_ptr<const Material> material = renderable->material();
for(size_t i=0;i <mScene->lights().size();++i)
{
const Light &light = *(mScene->lights()[i].get());
//Shadow ray from light to hit point.
const Vec3d L = (intersection.position() + offset) - light.position();
const Ray shadowRay(light.position(), L);
//Shade only if light in visible from intersection point.
if (!mScene->anyIntersection(shadowRay,L.length()))
color += material->shade(intersection,light);
}
// limit recursion depth
if (depth >= mMaxDepth)
return color;
Vec3d dir = reflect(intersection.ray().direction(), intersection.normal());
Ray reflectedRay(intersection.position() + offset, dir);
double reflectance = material->reflectance();
color = color * (1 - reflectance) + reflectance * trace(reflectedRay, depth - 1) + Vec4d(0.0,0.0,0.0,1.0);
return color;
}
Vec4d Raytracer::shade(const RayIntersection &intersection,
size_t depth) const {
// This offset must be added to intersection points for further
// traced rays to avoid noise in the image
const Vec3d offset(intersection.normal() * Math::safetyEps());
Vec4d color(0, 0, 0, 1);
std::shared_ptr<const Renderable> renderable = intersection.renderable();
std::shared_ptr<const Material> material = renderable->material();
for (size_t i = 0; i < mScene->lights().size(); ++i) {
const Light &light = *(mScene->lights()[i].get());
//Shadow ray from light to hit point.
const Vec3d L = (intersection.position() + offset) - light.position();
const Ray shadowRay(light.position(), L);
//Shade only if light in visible from intersection point.
if (!mScene->anyIntersection(shadowRay, L.length()))
color += material->shade(intersection, light);
}
return color;
}